I can't seem to import my Blu-ray Disc

I have Nero Video 2014. I want to take a concert from a commercial Blu-ray concert disc and just burn that to a new blu-ray disc. But every time I try to import the blu-ray it says something like it can't find any importable disc.

Seems to me I should be able to import the concerts from the original blu-ray and put them into the editing screen and just select the specific concert I want and then burn that to disc.
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